/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.druid.query.movingaverage;

import org.apache.druid.data.input.MapBasedRow;
import org.apache.druid.data.input.Row;
import org.apache.druid.query.dimension.DimensionSpec;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

public class MovingAverageHelper
{

  /**
   * @param dimensions A list of DimensionSpec in the specified in the query
   * @param row        The Row to be used for looking up dimension values
   *
   * @return A Map of dimension/value from the row
   */

  public static Map<String, Object> getDimKeyFromRow(Collection<DimensionSpec> dimensions, Row row)
  {

    Map<String, Object> key = new HashMap<>();
    Map<String, Object> event = ((MapBasedRow) row).getEvent();

    for (DimensionSpec dimension : dimensions) {
      key.put(dimension.getOutputName(), event.get(dimension.getOutputName()));
    }

    return key;
  }

}
